Thermoplastic resin film air bag

• US 5,909,895 A
• Filed: 06/10/1997
• Issued: 06/08/1999
• Est. Priority Date: 06/11/1996
• Status: Expired due to Fees

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Iino, Yasuhiro, Matsushima, Yosuke
• Primary Examiner(s): English, Peter C.
• Application Number:
  US08/872,153
• Time in Patent Office: 728 Days
• Field of Search: 280/743.1, 280/728.1, 280/731
• US Class Current: 280/743.1
• CPC Class Codes: B29C 65/04 Dielectric heating, e.g. high-frequency welding , i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
• CPC Class Codes: B29C 65/4815 Hot melt adhesives, e.g. thermoplastic adhesives
• CPC Class Codes: B29C 65/5021 being multi-layered
• CPC Class Codes: B29C 65/5028 being textile in woven or non-woven form
• CPC Class Codes: B29C 65/5042 covering both elements to be joined
• CPC Class Codes: B29C 65/5057 positioned between the surfaces to be joined B29C65/5035 takes precedence
• CPC Class Codes: B29C 65/5071 and being composed by one single element
• CPC Class Codes: B29C 66/004 Preventing sticking together, e.g. of some areas of the parts to be joined
• CPC Class Codes: B29C 66/133 Fin-type joints, the parts to be joined being flexible the parts to be joined being rigid B29C66/1312
• CPC Class Codes: B29C 66/43 Joining a relatively small portion of the surface of said articles B29C66/45 takes precedence
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/723 being multi-layered B29C66/7292, B29C66/72941 take precedence
• CPC Class Codes: B29C 66/72328 Paper
• CPC Class Codes: B29C 66/729 Textile or other fibrous material made from plastics
• CPC Class Codes: B29C 66/73921 characterised by the materials of both parts being thermoplastics
• CPC Class Codes: B29C 66/81431 comprising a single cavity, e.g. a groove
• CPC Class Codes: B29C 66/83221 cooperating reciprocating tools, each tool reciprocating along one axis
• CPC Class Codes: B29K 2067/00 Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2077/00 Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• CPC Class Codes: B29L 2022/027 Air bags
• CPC Class Codes: B60R 2021/2358 : Bonding
• CPC Class Codes: B60R 2021/2359 : Welding
• CPC Class Codes: B60R 21/235 : characterised by their material

Abstract

An air bag comprises a facing sheet and a backing sheet of thermoplastic resin film and laminated on at least an outer peripheral joining region thereof with a thermoplastic resin film. An adhesion reinforcing layer(s) is interposed between the facing sheet and the backing sheet at the joining region and made from a thermoplastic resin provided that an insulating layer is interposed in the adhesion reinforcing layer at a region ranging from a position corresponding to an approximately center of the outer peripheral joining region toward the inside thereof. The facing and backing sheets and the adhesion reinforcing layer are heat-welded together at the outer peripheral joining region.

Claims

1. An air bag comprising:

a facing sheet and a backing sheet each made from a thermoplastic resin film and laminated on at least a joining region thereof at outer peripheral portions with a thermoplastic resin film, at least one adhesion reinforcing layer interposed between the facing sheet and the backing sheet at the joining region and made from a thermoplastic resin, and an insulating layer interposed proximate the adhesion reinforcing layer at a region ranging from a position corresponding to an approximate center of the joining region toward the inside thereof, the facing and backing sheets and the adhesion reinforcing layer being heat-welded together at the joining region.

2. An air bag according to claim 1, wherein each of the facing sheet and backing sheet is made from an urethane film, and laminated over a full surface of said facing sheet and said backing sheet.

3. An air bag according to claim 1, wherein the adhesion reinforcing layer is made from an urethane resin film and laminated on opposite surfaces with a thermoplastic resin film.

4. An air bag according to claim 1, wherein the adhesion reinforcing layer is a ring of urethane resin having a shape corresponding to the joining region and provided on an inner peripheral face with a notch having a given depth.

5. An air bag according to claim 1, wherein the adhesion reinforcing layer is formed by joining free ends of a body having slits formed on a surface at given intervals to each other so as to have a ring shape corresponding to the outer peripheral joining region.

6. An air bag according to claim 1 further comprising a second adhesion reinforcing layer and said insulating layer is interposed between said adhesion reinforcing layer and said second adhesion reinforcing layer.

7. An air bag according to claim 1, wherein said adhesion reinforcing layer comprises a single layer split into two portions and said insulating layer is interposed between said split portions.